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| 75Plus:
Hi David, I guess it is all in how you interpret the article. The way I read this excerpt "Beginning in mid-June, the engine will undergo a series of 10 test firings that will last several months." the series of tests not the test themselves will last several months. I will give Marc a call and find out exactly how long a firing lasts and let you know. Joe |
| 75Plus:
Below is an email I sent to Marc requesting testing info along with his reply. I think it will be of interest to our members. Hi Marc, On one of the Message Boards I frequent the question of the duration of a test burn for the J-2X came up. I volunteered to find out so here I am. Could you please help me out?? Thanks, Hi Uncle Joe! This is a very timely question. We’ve just gotten underway with development testing of the first J-2X. So far we’ve run a chill test (no ignition) and four hot-fires with durations of 1.9, 3.4, 7.0, and 32.2 seconds, progressively. (The 3.4 second test was cut early due to overshooting power level. This is a fixed-orifice engine which means it has no active control.) The J-2X was designed for a maximum single-burn, mission duration around 500 seconds. It is capable of a second, shorter burn to leave low earth orbit as the main propulsion on an earth departure stage. During development testing, burn durations will vary with the nominal being around 500 seconds; However, we might run for as long as a thousand seconds on some tests. Flight acceptance testing will include a calibration test between 200 and 300 seconds and a mission simulation around 500 seconds. The following is a link to a J-2X blog: http://blogs.nasa.gov/cm/newui/blog/viewpostlist.jsp?blogname=J2X |
| dickda1:
I was a NASA engineer (now retired) - worked on Skylab and the Shuttle. Most all the engineers/scientists that designed and worked on the monster lift vehicles like Saturn 5 are now retired as well. The U.S. will be hard pressed to build another like it I fear. Dick |
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